The Magicians of Caprona. Diana Wynne Jones

"Enter the enchanting world of The Magicians of Caprona, where music and spells collide in the mysterious Dukedom of Caprona. Two rival families run the magical business, but when their spells start to backfire, they point fingers at each other. Chrestomanci suspects foul play, while others believe it's the work of a White Devil. Will a different kind of magic be needed to save Caprona? Discover the captivating tale of rivalry and enchantment in this Diana Wynne Jones classic, now with extra bits."